Help me pick my amp(amps)!!!

Need immediate assistance on this. Either i get a Sundown 2500 and run it @ .5 or 2 vfl 100.1 and run each @ 1ohm. Currently have stock 110 alt soon to be EA 200 amp, Big 3 done, oem batt in stock location and 2 kinetik hc 1800 in the rear. Need some immediate help as i am going to be making my purchase today!!